Shrouded Destiny

The Song is sung, and the Dawn is won, but the victory is bittersweet, and the cost is too high. Yet there is little that could not be done with magic if you were willing to pay the price. Dues are paid, fates are changed, and even destiny itself is covered with a shroud. AU + Time travel. Or alternately:

The Battle for the Dawn is won, but everyone Bran knew was dead, so he throws a tantrum of epic proportions and drags Bloodraven into tossing unsuspecting and just freshly killed Jon Snow back into the past by sacrificing themselves. Messing with time makes ripples in the timeline, and some things are not the same.